Long XLF segments from client's CMS export

Hello! This question was asked during the Q&A session this afternoon, and I believe Paul said that it's a high-level query so posting here:

We have received an XLF from a client containing really long segments - how can we re-segment these long segments so it's easier for the translators to work on them, but also so it doesn't affect the XLF from being re-imported into the client's CMS at the end of the project?

Thanks in advance for any assistance on this point!